Python实现文件的压缩及解压

    def zip_dir(dirname,zipfilename):  
        """ 
        | ##@函数目的: 压缩指定目录为zip文件 
        | ##@参数说明：dirname为指定的目录，zipfilename为压缩后的zip文件路径 
        | ##@返回值：无 
        | ##@函数逻辑： 
        """  
        filelist = []  
        if os.path.isfile(dirname):  
            filelist.append(dirname)  
        else :  
            for root,dirs,files in os.walk(dirname):  
                for name in files:  
                    filelist.append(os.path.join(root,name))  
      
        zf = zipfile.ZipFile(zipfilename,"w",zipfile.zlib.DEFLATED)  
        for tar in filelist:  
            arcname = tar[len(dirname):]  
            #print arcname  
            zf.write(tar,arcname)  
        zf.close()  

    def unzip_file(zipfilename,unziptodir):  
        """ 
        | ##@函数目的: 解压zip文件到指定目录 
        | ##@参数说明：zipfilename为zip文件路径，unziptodir为解压文件后的文件目录 
        | ##@返回值：无 
        | ##@函数逻辑： 
        """  
        if not os.path.exists(unziptodir):  
            os.mkdir(unziptodir,0777)  
        zfobj = zipfile.ZipFile(zipfilename)  
        for name in zfobj.namelist():  
            name = name.replace('','/')  
      
            if name.endswith('/'):  
                p = os.path.join(unziptodir,name[:-1])  
                if os.path.exists(p):  
                    # 如果文件夹存在，就删除之：避免有新更新无法复制  
                    shutil.rmtree(p)  
                os.mkdir(p)  
            else:  
                ext_filename = os.path.join(unziptodir,name)  
                ext_dir= os.path.dirname(ext_filename)  
                if not os.path.exists(ext_dir):  
                    os.mkdir(ext_dir,0777)  
                outfile = open(ext_filename,'wb')  
                outfile.write(zfobj.read(name))  
                outfile.close()